Mouthpiece for a spirometer



FIG. 1 is a perspective view of the mouthpiece for a spirometer showing my new design;

FIG. 2 is an elevation view of the mouthpiece of FIG. 1;

FIG. 3 is a top plan view of the mouthpiece of FIG. 1;

FIG. 4 is an end view from the right end of the mouthpiece as shown in FIG. 2;

FIG. 5 is an end view from the left end of the mouthpiece as shown in FIG. 2; and

FIG. 6 is a bottom plan view of the mouthpiece of FIG. 1. 

The ornamental design for a mouthpiece for a spirometer, as shown. 